Troubleshooting for MSP Duct Type Indoor Unit
SiSG121917E
131
Part 6 Service Diagnosis
6.4 Fan PCB Abnormality
Error Code
A8
Method of Error
Detection
Microcomputer checks the voltage state of the fan PCB.
Error Decision
Conditions
Overvoltage or voltage drop is detected on the fan PCB.
Supposed
Causes
Defective fan PCB
External factor such as noise
Troubleshooting
Caution
Be s
u
re to t
u
rn off the po
w
er s
w
itch
b
efore connecting
or disconnecting connectors, or parts may
b
e damaged.
Check for the indoor
u
nit control
PCB (A1P) and the fan PCB
(A2P).
Connect the connector correctly.
N
O
YES
YES
Is the
connector X3A on
the fan PCB connected
correctly?
Connect the connector correctly.
N
O
YES
Is the
connector X70A on
the indoor
u
nit main PCB
connected correctly?
Replace the harness.
YES
Is the harness
connecting X3A and X70A
b
roken?
N
O
N
O
Remo
v
e the external factor.
YES
Is there any external
factor s
u
ch as noise?
N
ormal.
N
O
Error is displayed
again.
T
u
rn OFF the po
w
er s
u
pply
and then t
u
rn it O
N
again.
Start operation
w
ith the
remote controller.
(R2493
8
)
